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Rubber composition, crosslinked product, and tire

a crosslinked product and rubber technology, applied in the direction of tire parts, vehicle components, rolling resistance optimization, etc., can solve the problems of poor dispersibility, and achieve the effect of improving the low hysteresis loss property and improving the dispersibility of silica

Active Publication Date: 2020-03-19
ENEOS MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent relates to a modified conjugated diene-based polymer that has improved properties, such as low hysteresis loss, by incorporating a specific functional group that interacts with silica. The modified polymer can be produced by reacting a conjugated diene-based polymer with a compound having a functional group that interacts with silica. The amount of the functional group in the modified polymer is preferably 10 mass% or less, relative to the total mass of the polymer. The functional group can be an amino group, an imino group, a phosphorus group, a sulfur group, or a thiol group. The polymer can be produced using any conventionally known method. The patent also describes specific modifiers that can be used to modify the polymerization end terminal or the main chain. Overall, the patent provides a technical solution for improving the properties of conjugated diene-based polymers.

Problems solved by technology

Silica particles have silanol groups on their surfaces, and thus are disadvantageous in that they are likely to aggregate in a rubber composition and exhibit poor dispersibility therein.

Method used

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  • Rubber composition, crosslinked product, and tire

Examples

Experimental program
Comparison scheme
Effect test

production example 1

ce-Modified Silica

[0056]Silica (trade name: Hi-Sil EZ160Z, manufactured by PPG Silica Products) (1,000 g) was added to a Henschel mixer, and the temperature in the mixer was adjusted to 100° C. 3-Mercaptopropyltrimethoxysilane (71.43 g) was then added with spraying to the mixer, and the resultant mixture was stirred for 10 minutes. Subsequently, stearic acid (trade name: LUNAC S-30, manufactured by Kao Corporation) (40 g) was added to the mixer, and then the temperature in the mixer was increased to 120° C., followed by further stirring for 30 minutes, to thereby prepare surface-modified silica M.

production example 2

P Having Crystalline Character

[0057]A polymerization solution (3.5 L) (butadiene: 30 mass %, cyclohexane: 70 mass %) was added to a stainless steel reaction vessel (inner volume: 5 L) equipped with a stirrer and purged with nitrogen gas. Subsequently, water (5.3 mmol), diethylaluminum chloride (10.5 mmol), carbon disulfide (1.8 mmol), cyclooctadiene (40 mmol), and cobalt octoate (0.04 mmol) were added to the reaction vessel, and the mixture was stirred at 50° C. for 60 minutes, to thereby allow polymerization to proceed. Thereafter, butadiene (200 mL), water (4.5 mmol), triethylaluminum chloride (13.4 mmol), and cobalt octoate (0.02 mmol) were added to the reaction vessel, and the mixture was stirred at 50° C. for 60 minutes, to thereby allow polymerization to proceed. A 1% solution of phenyl-3-naphthylamine in ethanol was added to the resultant mixture, to thereby terminate polymerization. Thereafter, unreacted butadiene and 2-butene were removed through evaporation, and the remain...

production example 3

Q Having Crystalline Character

[0058]A polymerization solution (3.5 L) (butadiene: 30 mass %, cyclohexane: 70 mass %) was added to a stainless steel reaction vessel (inner volume: 5 L) equipped with a stirrer and purged with nitrogen gas. Subsequently, water (5.3 mmol), diethylaluminum chloride (10.5 mmol), carbon disulfide (1.8 mmol), cyclooctadiene (40 mmol), and cobalt octoate (0.04 mmol) were added to the reaction vessel, and the mixture was stirred at 50° C. for 30 minutes, to thereby allow polymerization to proceed. Thereafter, butadiene (560 mL), water (4.5 mmol), triethylaluminum chloride (13.4 mmol), and cobalt octoate (0.04 mmol) were added to the reaction vessel, and the mixture was stirred at 50° C. for 30 minutes, to thereby allow polymerization to proceed. A 1% solution of phenyl-β-naphthylamine in ethanol was added to the resultant mixture, to thereby terminate polymerization. Thereafter, unreacted butadiene and 2-butene were removed through evaporation, and the remain...

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Abstract

A rubber composition contains (A) a modified conjugated diene-based polymer, (B) modified silica, and (C) a polymer having crystalline character. A crosslinked product is produced through crosslinking of the rubber composition containing the modified conjugated diene-based polymer (A), the modified silica (B), and the polymer having crystalline character (C). The crosslinked product is used for producing a tire including a tread and a sidewall, wherein at least one of the tread and the sidewall is formed of the crosslinked product.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2018-173054, filed Sep. 14, 2018. The contents of this application are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present disclosure relates to a rubber composition, a crosslinked product, and a tire.Discussion of the Background[0003]Conjugated diene-based polymers (e.g., styrene-butadiene copolymer) produced through polymerization of a conjugated diene compound exhibit good properties (e.g., thermal resistance, wear resistance, mechanical strength, and processability). Thus, the conjugated diene-based polymers have been widely used in various industrial products, including pneumatic tires, vibration-proof rubber bodies, and hoses. In particular, a conjugated diene-based polymer (e.g., S-SBR) produced through solution polymerization has a relatively narrow molecular weight dist...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L9/06C08K3/36B60C1/00
CPCB60C1/0025C08K3/36B60C1/0016C08K2003/2296C08K3/06C08L91/00C08K5/09C08L9/06C08K5/0025C08K3/22C08L15/00C08F236/06C08C19/22C08C19/25C08C19/44C08F236/10Y02T10/86C08L9/00C08L65/00C08K5/18C08K5/31C08K5/47C08K5/548C08L23/26C08L23/16C08F212/08C08F4/48C08F2/06
Inventor TANI, KOICHIROSUGIYAMA, NAOKIKOBAYASHI, KUNPEITANAKA, RYOJI
Owner ENEOS MATERIALS CORP
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